Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 41

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IMPORTANT

Earn 100

Let $[\in_{0}]$ denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = time and A = electric current, then :

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Important Questions on Physical World and Measurement

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IMPORTANT

Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 42

If Surface tension

(S)

, Moment of Inertia

(I)

and Planck's constant

(h),

were to be taken as the fundamental units, the dimensional formula for linear momentum would be:

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 43

The percentage errors in the measurement of mass and speed are

2 %

and

3 %

, respectively. How much will be the maximum error in the estimation of kinetic energy obtained by measuring mass and speed?

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 44

How many significant figures should be written in the sum

4.56 g + 9.032 g + 580.0078 g + 540.439 g

?

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 45

The diameter and height of a cylinder are measured by a meter scale to be

12 .6 \pm 0 .1 cm

and

34 .2 \pm 0 .1 cm

, respectively. What will be the value of its volume in appropriate significant figures?

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 46

The period of oscillation of a simple pendulum is

T = 2 π \sqrt{\frac{l}{g}} .

Measured value of

l

is

20.0 cm

, known to

1 mm

accuracy and time for

100

oscillations of the pendulum is found to be

90 s

using a wristwatch of

1 s

resolution. The accuracy in the determination of

g

is

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 47

The percentage errors in quantities

P

,

Q

,

R

and

S

are

0.5 %

,

1 %

,

3 %

and

1.5 %

respectively in the measurement of a physical quantity

A= \frac{P^{3} Q^{2}}{\sqrt{R} S}

. The maximum percentage error in the value of

A

will be:

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 48

The area of a square is

5.29 c m^{2} .

The area of

7

such squares taking into account the significant figures is:

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 1>Q 49

The relative error in the determination of the surface area of a sphere is

α

. The relative error in the determination of its volume is